The 213,228-square-foot Gateway Tower, at One Memorial Drive, is 95 percent leased to tenants, including KMOV-TV, Fox Galvin, Infinity Broadcasting Corp. and the East-West Gateway Council of Governments.

Sovereign Partners said that since acquiring Gateway Tower in 2003, it has invested more than $3 million in capital projects at the office tower, including an upgraded lobby, common areas and a new mechanical system.